Apps or other things that lead to problems with installer

OK, I found one thing that leads to problems with intaller, MobileChat.app. If you try to download it onto your touch it will cause installer to not be able to install anything for some reason. You cant uninstall it from installer, you have to ssh into your ipod and delete all files that deal with it. Post any other apps or other things that lead to installer problems, also, if you have a fix for it, also post it.